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We extend the covariant analysis of the brane cosmological evolution in orderto take into account, apart from a general matter content and aninduced-gravity term on the brane, a Gauss-Bonnet term in the bulk. Thegravitational effect of the bulk matter on the brane evolution can be describedin terms of the total bulk mass as measured by a bulk observer at the locationof the brane. This mass appears in the effective Friedmann equation through aterm characterized as generalized dark radiation that induces mirage effects inthe evolution. We discuss the normal and self-accelerating branches of thecombined system. We also derive the Raychaudhuri equation that can be used inorder to determine if the cosmological evolution is accelerating.

Modified brane cosmologies with induced gravity, arbitrary matter content and a Gauss-Bonnet term in the bulk